Global patent index - EP 0991589 A1

EP 0991589 A1 2000-04-12 - SOLUBLE ACID POLYPHOSPHATES AND DEVICE FOR THEIR PRODUCTION

Title (en)

SOLUBLE ACID POLYPHOSPHATES AND DEVICE FOR THEIR PRODUCTION

Title (de)

LÖSLICHE, SAURE POLYPHOSPHATE UND VERFAHREN UND VORRICHTUNG ZU IHRER HERSTELLUNG

Title (fr)

POLYPHOSPHATES ACIDES SOLUBLES ET DISPOSITIF UTILISE POUR LEUR FABRICATION

Publication

EP 0991589 A1 (DE)

Application

EP 98938627 A

Priority

  • DE 19727144 A
  • EP 9803823 W

Abstract (en)

[origin: DE19727144A1] The invention relates to a method for producing soluble acid polyphosphates with an Na/P ratio of 0.3 to 0.6, a P2O5 content of over 77 %wt., a Na2O content of under 20 % and a residual water content of 3-10 %. The invention is characterized in that an aqueous phosphate solution is dried in order to form chain-like polyphosphates with an average chain length of 10 to 30, and then fused for 30-180 minutes at temperatures of 400-600 DEG C. The fusion is cooled, forming a vitreous product. During fusion, steam pressure of 0.1 to 0.5 bar is maintained in the atmosphere in contact with the fusion. The invention also relates to the polyphosphates produced by this method and to their use.

IPC 1-7 (main, further and additional classification)

C01B 25/41; A23C 19/082

IPC 8 full level (invention and additional information)

A23C 19/082 (2006.01); C01B 25/41 (2006.01)

CPC (invention and additional information)

C01B 25/41 (2013.01); A23C 19/082 (2013.01)

Citation (search report)

See references of WO 9900324A1

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI NL SE

EPO simple patent family

DE 19727144 A1 19990107; AU 734894 B2 20010628; AU 8728198 A 19990119; BR 9811271 A 20000718; CA 2295687 A1 19990107; CA 2295687 C 20031118; CN 1161273 C 20040811; CN 1261328 A 20000726; CZ 300062 B6 20090121; CZ 9904510 A3 20000614; EP 0991589 A1 20000412; HU 0003050 A2 20010228; HU 0003050 A3 20030228; JP 2002507957 A 20020312; PL 192090 B1 20060831; PL 337655 A1 20000828; SK 176899 A3 20000711; SK 286395 B6 20080905; WO 9900324 A1 19990107

INPADOC legal status

2010-10-06 [18R] REFUSED

- Ref Legal Event Code: 18R

- Effective date: 20100310

2001-07-25 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010607

2000-04-12 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000126

2000-04-12 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE ES FR GB IT LI NL SE

2000-04-12 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: SI PAYMENT 20000126